A cantor is a musician working in a church with responsibilities for the singing in the church. In the Catholic church, the Cantor is a clergyman while in the Protestant churches he is a church musician. A church building (or simply church) is a building used in Christian worship. ... The name Catholic Church can mean a visible organization that refers to itself as Catholic, or the invisible Christian Church, viz. ... Protestantism is a general grouping of denominations within Christianity. ...